Evaluation of enthalpy change due to hydrogen desorption for lithium amide/imide system by differential scanning calorimetry

Shigehito Isobe; Takayuki Ichikawa; Kazuhiko Tokoyoda; Nobuko Hanada; Haiyan Leng; Hironobu Fujii; Yoshitsugu Kojima

doi:10.1016/j.tca.2007.11.013

Evaluation of enthalpy change due to hydrogen desorption for lithium amide/imide system by differential scanning calorimetry

Shigehito Isobe, Takayuki Ichikawa^*, Kazuhiko Tokoyoda, Nobuko Hanada, Haiyan Leng, Hironobu Fujii, Yoshitsugu Kojima

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Enthalpy change (ΔH) due to hydrogen desorption (H-desorption) for the lithium amide/imide system was evaluated by differential scanning calorimetry (DSC) measurement. In order to obtain the accurate and precise value of ΔH, we have paid special attention to following two points for correcting raw experimental data. One is to determine a cell constant of DSC equipment, which was evaluated by using the TiO₂-doped MgH₂ compound as a reference because of its quite similar hydrogen desorption properties to that of the lithium amide/imide system. The other is to estimate the sample amount corresponding to the H-desorption reaction from weight loss in the thermogravimetric (TG) analysis. By performing both the corrections, the ΔH value due to the H-desorption reaction from LiNH₂ + LiH to Li₂NH + H₂ was evaluated to be 67 kJ/mol H₂.

Original language	English
Pages (from-to)	35-38
Number of pages	4
Journal	Thermochimica Acta
Volume	468
Issue number	1-2
DOIs	https://doi.org/10.1016/j.tca.2007.11.013
Publication status	Published - 2008 Feb 5
Externally published	Yes

Keywords

Calorimetry
Gas-solid reactions
Hydrogen absorbing materials
Thermal analysis

ASJC Scopus subject areas

Instrumentation
Condensed Matter Physics
Physical and Theoretical Chemistry

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10.1016/j.tca.2007.11.013

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title = "Evaluation of enthalpy change due to hydrogen desorption for lithium amide/imide system by differential scanning calorimetry",

abstract = "Enthalpy change (ΔH) due to hydrogen desorption (H-desorption) for the lithium amide/imide system was evaluated by differential scanning calorimetry (DSC) measurement. In order to obtain the accurate and precise value of ΔH, we have paid special attention to following two points for correcting raw experimental data. One is to determine a cell constant of DSC equipment, which was evaluated by using the TiO2-doped MgH2 compound as a reference because of its quite similar hydrogen desorption properties to that of the lithium amide/imide system. The other is to estimate the sample amount corresponding to the H-desorption reaction from weight loss in the thermogravimetric (TG) analysis. By performing both the corrections, the ΔH value due to the H-desorption reaction from LiNH2 + LiH to Li2NH + H2 was evaluated to be 67 kJ/mol H2.",

keywords = "Calorimetry, Gas-solid reactions, Hydrogen absorbing materials, Thermal analysis",

author = "Shigehito Isobe and Takayuki Ichikawa and Kazuhiko Tokoyoda and Nobuko Hanada and Haiyan Leng and Hironobu Fujii and Yoshitsugu Kojima",

note = "Funding Information: This work was supported by the project “Development for Safe Utilization and Infrastructure of Hydrogen Industrial Technology” in NEDO, Japan, by “JSPS Research Fellow for Young Scientist” and by the Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Sciences and Culture of Japan.",

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doi = "10.1016/j.tca.2007.11.013",

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T1 - Evaluation of enthalpy change due to hydrogen desorption for lithium amide/imide system by differential scanning calorimetry

AU - Isobe, Shigehito

AU - Ichikawa, Takayuki

AU - Tokoyoda, Kazuhiko

AU - Hanada, Nobuko

AU - Leng, Haiyan

AU - Fujii, Hironobu

AU - Kojima, Yoshitsugu

N1 - Funding Information: This work was supported by the project “Development for Safe Utilization and Infrastructure of Hydrogen Industrial Technology” in NEDO, Japan, by “JSPS Research Fellow for Young Scientist” and by the Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Sciences and Culture of Japan.

PY - 2008/2/5

Y1 - 2008/2/5

N2 - Enthalpy change (ΔH) due to hydrogen desorption (H-desorption) for the lithium amide/imide system was evaluated by differential scanning calorimetry (DSC) measurement. In order to obtain the accurate and precise value of ΔH, we have paid special attention to following two points for correcting raw experimental data. One is to determine a cell constant of DSC equipment, which was evaluated by using the TiO2-doped MgH2 compound as a reference because of its quite similar hydrogen desorption properties to that of the lithium amide/imide system. The other is to estimate the sample amount corresponding to the H-desorption reaction from weight loss in the thermogravimetric (TG) analysis. By performing both the corrections, the ΔH value due to the H-desorption reaction from LiNH2 + LiH to Li2NH + H2 was evaluated to be 67 kJ/mol H2.

AB - Enthalpy change (ΔH) due to hydrogen desorption (H-desorption) for the lithium amide/imide system was evaluated by differential scanning calorimetry (DSC) measurement. In order to obtain the accurate and precise value of ΔH, we have paid special attention to following two points for correcting raw experimental data. One is to determine a cell constant of DSC equipment, which was evaluated by using the TiO2-doped MgH2 compound as a reference because of its quite similar hydrogen desorption properties to that of the lithium amide/imide system. The other is to estimate the sample amount corresponding to the H-desorption reaction from weight loss in the thermogravimetric (TG) analysis. By performing both the corrections, the ΔH value due to the H-desorption reaction from LiNH2 + LiH to Li2NH + H2 was evaluated to be 67 kJ/mol H2.

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KW - Gas-solid reactions

KW - Hydrogen absorbing materials

KW - Thermal analysis

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Evaluation of enthalpy change due to hydrogen desorption for lithium amide/imide system by differential scanning calorimetry

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Keywords

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